Process and apparatus for the production of blister packs

ABSTRACT

Process for the production of plastic blister packs, the top portion of which (PVAL) is subjected to thermal treatment in a furnace, and the apparatus for producing it is of the horizontal type.

[0001] The use of these deodorants concerns certain fields ofapplication such as, for example:

[0002] deodorants for dishwashers, for washing machines and for watercloset toilets.

STATE OF THE ART

[0003] There exists a blister pack which is not sealed by apolythene-aluminium compound, but is sealed by a compound of variousplastic materials so that at the time of use, the upper layer replacingthe aluminium detaches in the presence of water and allows the secondlayer to give off controlled quantities of the perfume contained in theblister pack into the surroundings.

[0004] On account of the physico-chemical characteristics of the liquidperfumes, which are in particular employed as deodorants for dishwashers(high volatility, density in the vicinity of 0.85 and very lowviscosity), these blister packs were produced and are still beingproduced on vertical apparatus wherein the process sequence may beindicated as follows:

[0005] a) thermoforming the container constituting the blister pack;

[0006] b) compounding the films (PE/PA/PA+PE/ALUMINIUM) and relatedfirst welding. This is referred to as first welding because, due to theabove mentioned properties of the perfume and due to the small emptyspace that must be left inside the blister pack, the first welding isnot effected over the entire perimeter of the blister pack, but a smallportion is left open for the introduction of a hollow needle throughwhich filling of the blister pack is performed;

[0007] c) filling of the blister pack by means of a filling device withvertical needles;

[0008] d) second welding and punching of the sheet constituted by theblister packs;

[0009] e) manual positioning of the blister packs inside the containerof use.

[0010] This technology still gives rise to grave problems with respectto quality which render the product unsalable due to penetration of theperfume to the outside through the welds, and due to delamination of thePVAL film in the presence of humidity, a delamination which isparticularly rapid in the presence of humidity and temperatures in thevicinity of 30° C.

OUTLINE OF THE INVENTION

[0011] The invention has the object of solving the above mentionedproblem by acting both on the materials and the kind of technologyemployed.

[0012] The materials generally used are compounded and thus comprisedof:

[0013] PE/PP/PA utilised through thermoforming of the blister packcontainer.

[0014] PVAL/PE/EVA, wherein the PVAL used for the upper part of theblister pack must come off in the presence of water at the time of use.

[0015] The materials may be procured easily on the market without anylimitations and are employed for various purposes.

[0016] The materials are provided in the form of rolls, the dimensionsof which depend on the apparatus on which they are used.

[0017] The problem of delamination in the presence of humidity and oftemperature around 30.0° C. is solved by subjecting the PVAL to athermal treatment.

[0018] The rolls are placed in an appropriately designed and implementedfurnace and subjected to temperatures starting out from the ambienttemperature up to 80-98° C. and during a time period which may vary froma minimum of 30 hours to a maximum of 200 hours.

[0019] The temperature and the time period depend on the age of thematerial, on the storage conditions to which the material is subjectedsince the time of its production, and lastly the atmospheric conditionsat the time of use. The following tables give an example for the thermaltreatment cycle.

[0020] Table 1 indicates the maximum variations between effectivetemperature and specified temperature. Tables 2 to 18 refer to theactual heat treatment cycle.

Maximum Variations Between Effective Temperature and SpecifiedTemperature

[0021] in the sections of the heat treatment profile: TABLE 1 Section 1:Upper variation: 2.8° C. Lower variation: −3.9° C. Section 2: Uppervariation: 0.8° C. Lower variation: −3.4° C. Section 3: Upper variation:81.0° C. Lower variation: 0.0° C. Section 4: Upper variation: 0.0° C.Lower variation: 0.0° C. Section 5: Upper variation: 0.0° C. Lowervariation: 0.0° C.

Heat Treatment Cycle Specified in Accordance with the FollowingParameters

[0022] TABLE 2 [DRAWING] Type of specified profile: 3 TRANSITIONS t1:  1h 0 min TEMP1:  92.0° C. t2: 50 h 0 min t3: 51 h 0 min TEMP3:  0.0° C.t4:  0 h 0 min t5:  0 h 0 min

Actual Thermal Treatment Cycle

[0023] Time PROGRESSION: t (h:min) SPECIFIED TEMPERATURE: Timp (° C.)FURNACE INTERNAL TEMPERATURE: Tintern (° C.) ENTRY TEMPERATURE: Ting (°C.) EXIT TEMPERATURE: Tout (° C.) HUMIDITY: U (%)

[0024] TABLE 3 Development of the thermal treatment cycle: t Timp.Tintern. Ting. Tout. U. 0:10 47.2 38.3 46.5 41.4 41.6 0:20 57.3 49.655.6 47.6 27.6 0:30 66.0 57.7 63.0 52.0 20.9 0:40 74.6 66.3 72.2 56.215.9 0:50 83.3 74.5 83.0 60.1 12.2 1:0  92.0 82.9 90.4 64.0 9.3 1:1092.0 84.3 88.9 66.3 8.1

[0025] TABLE 4 t Timp. Tintern. Ting. Tout. U. 1:20 92.0 85.4 91.1 67.37.7 1:30 92.0 87.2 92.2 67.8 7.4 1:40 92.0 86.5 89.7 68.0 7.4 1:50 92.087.2 90.8 68.0 7.5 2:0  92.0 87.3 90.7 68.1 7.5 2:10 92.0 87.7 89.5 68.17.5 2:20 92.0 88.6 92.5 68.1 7.7 2:30 92.0 87.6 89.9 67.5 8.2 2:40 92.088.8 90.8 68.0 8.2 2:50 92.0 88.6 91.8 66.8 8.8 3:0  92.0 88.6 90.0 66.79.2 3:10 92.0 89.5 92.7 66.7 9.5 3:20 92.0 88.6 90.1 66.7 9.6 3:30 92.089.7 91.6 66.5 9.9 3:40 92.0 90.3 92.2 66.3 10.0 3:50 92.0 90.0 90.066.5 10.2 4:0  92.0 91.1 92.7 67.0 10.2 4:10 92.0 90.5 90.1 67.2 10.24:20 92.0 91.6 91.9 67.3 10.4 4:30 92.0 90.9 91.4 67.5 10.5

[0026] TABLE 5 t Timp. Tintern. Ting. Tout. U. 4:40 92.0 91.2 90.4 67.510.6 4:50 92.0 91.8 92.5 67.5 10.8 5:0  92.0 91.0 90.5 67.5 10.9 5:1092.0 92.0 91.3 67.6 10.9 5:20 92.0 91.5 91.9 67.5 11.0 5:30 92.0 91.690.4 67.5 11.1 5:40 92.0 92.2 92.4 67.5 11.1 5:50 92.0 91.5 90.6 67.511.1 6:0  92.0 92.2 91.2 67.5 11.1 6:10 92.0 91.9 91.9 67.5 11.0 6:2092.0 91.8 90.5 67.5 10.9 6:30 92.0 92.6 92.3 67.5 10.9 6:40 92.0 91.890.8 67.5 10.9 6:50 92.0 92.5 91.3 67.5 10.8 7:0  92.0 92.1 91.9 67.310.8 7:10 92.0 92.0 90.6 67.4 10.7 7:20 92.0 92.7 92.1 67.5 10.6 7:3092.0 92.0 91.0 67.5 10.7 7:40 92.0 92.6 91.1 67.5 10.6 7:50 92.0 92.592.4 67.6 10.6

[0027] TABLE 6 t Timp. Tintern. Ting. Tout. U. 8:0 92.0 92.1 90.6 67.510.7  8:10 92.0 92.8 91.7 67.5 10.7  8:20 92.0 92.2 91.6 67.2 10.8  8:3092.0 92.5 90.8 67.3 10.7  8:40 92.0 92.8 92.4 67.4 10.6  8:50 92.0 92.091.1 68.6 10.2 9:0 92.0 92.1 91.6 69.1 9.9  9:10 92.0 91.7 91.9 69.2 9.7 9:20 92.0 91.5 90.7 69.1 9.7  9:30 92.0 92.0 91.5 69.3 9.5  9:40 92.091.8 92.3 69.3 9.4  9:50 92.0 91.5 90.8 69.1 9.4 10:0  92.0 91.9 91.369.0 9.3 10:10 92.0 92.0 92.4 69.0 9.3 10:20 92.0 91.5 90.9 69.0 9.110:30 92.0 92.0 91.2 69.3 9.0 10:40 92.0 92.1 92.4 69.4 8.8 10:50 92.091.6 90.9 69.5 8.7 11:0  92.0 92.0 91.1 69.5 8.6 11:10 92.0 92.2 92.369.4 8.6

[0028] TABLE 7 t Timp. Tintern. Ting. Tout. U. 11:20 92.0 91.8 91.3 69.58.6 11:30 92.0 92.0 90.9 69.5 8.4 11:40 92.0 92.3 92.0 69.5 8.4 11:5092.0 91.8 91.6 69.5 8.4 12:0  92.0 91.8 90.9 69.5 8.3 12:10 92.0 92.291.5 69.5 8.1 12:20 92.0 92.2 92.3 69.5 8.1 12:30 92.0 91.8 91.1 69.68.0 12:40 92.0 92.0 90.9 69.5 8.0 12:50 92.0 92.3 92.0 69.5 7.9 13:0 92.0 92.0 91.8 69.4 7.9 13:10 92.0 91.9 90.9 69.5 7.9 13:20 92.0 92.291.2 69.5 7.8 13:30 92.0 92.5 92.2 69.5 7.7 13:40 92.0 92.0 91.5 69.57.7 13:50 92.0 92.0 90.9 69.5 7.6 14:0  92.0 92.4 91.5 69.5 7.6 14:1092.0 92.3 92.2 69.5 7.5 14:20 92.0 92.0 90.9 69.4 7.5 14:30 92.0 92.391.3 69.5 7.5

[0029] TABLE 8 t Timp. Tintern. Ting. Tout. U. 14:40 92.0 92.5 92.2 69.47.4 14:50 92.0 92.0 91.3 69.4 7.4 15:0  92.0 92.1 90.9 69.4 7.3 15:1092.0 92.5 91.6 69.4 7.3 15:20 92.0 92.4 92.3 69.4 7.2 15:30 92.0 92.091.1 69.3 7.2 15:40 92.0 92.2 91.1 69.3 7.2 15:50 92.0 92.6 92.0 69.37.2 16:0  92.0 92.3 91.9 69.3 7.2 16:10 92.0 92.1 91.1 69.4 7.2 16:2092.0 92.4 91.3 69.4 7.1 16:30 92.0 92.7 92.2 69.3 7.0 16:40 92.0 92.291.5 69.4 7.0 16:50 92.0 92.2 91.0 69.1 7.1 17:0  92.0 92.6 91.5 69.07.1 17:10 92.0 92.6 92.4 69.2 7.0 17:20 92.0 92.2 91.3 69.1 7.1 17:3092.0 92.3 91.0 69.2 7.0 17:40 92.0 92.7 91.9 69.2 7.0 17:50 92.0 92.592.0 69.1 7.0

[0030] TABLE 9 t Timp. Tintern. Ting. Tout. U. 18:0  92.0 92.1 91.1 69.07.0 18:10 92.0 92.5 91.2 69.1 6.9 18:20 92.0 92.7 92.2 69.3 6.9 18:3092.0 92.2 91.7 69.2 6.8 18:40 92.0 92.2 91.0 69.3 6.8 18:50 92.0 92.591.3 69.3 6.8 19:0  92.0 92.7 92.2 69.3 6.8 19:10 92.0 92.5 91.7 69.36.8 19:20 92.0 92.2 91.1 69.2 6.7 19:30 92.0 92.4 91.1 69.2 6.7 19:4092.0 92.6 91.7 69.1 6.8 19:50 92.0 92.7 92.2 69.1 6.7 20:0  92.0 92.391.5 69.1 6.6 20:10 92.0 92.2 91.0 69.1 6.6 20:20 92.0 92.5 91.1 69.16.6 20:30 92.0 92.7 91.8 69.3 6.5 20:40 92.0 92.6 92.2 69.4 6.5 20:5092.0 92.3 91.5 69.4 6.5 21:0  92.0 92.2 91.1 69.5 6.4 21:10 92.0 92.591.1 69.3 6.4

[0031] TABLE 10 t Timp. Tintern. Ting. Tout. U. 21:20 92.0 92.9 92.069.3 6.4 21:30 92.0 92.5 92.0 69.3 6.3 21:40 92.0 92.2 91.2 69.4 6.321:50 92.0 92.4 91.1 69.3 6.3 22:0  92.0 92.7 91.5 69.3 6.2 22:10 92.092.7 92.2 69.3 6.2 22:20 92.0 92.3 91.5 69.3 6.1 22:30 92.0 92.3 91.069.4 6.1 22:40 92.0 92.7 91.5 69.4 6.1 22:50 92.0 92.8 92.2 69.3 6.023:0  92.0 92.4 91.4 69.3 6.1 23:10 92.0 92.5 91.1 69.3 6.0 23:20 92.092.8 91.8 69.4 5.9 23:30 92.0 92.7 92.2 69.3 5.9 23:40 92.0 92.4 91.569.4 5.9 23:50 92.0 92.4 91.1 69.4 5.9 24:0  92.0 92.7 91.4 69.4 5.924:10 92.0 92.8 92.2 69.3 5.9 24:20 92.0 92.5 91.8 69.3 5.9 24:30 92.092.3 91.1 69.0 6.0

[0032] TABLE 11 t Timp. Tintern. Ting. Tout. U. 24:40 92.0 92.6 91.269.0 5.9 24:50 92.0 92.8 91.8 69.0 6.0 25:0  92:0 92.7 92.2 69.0 6.025:10 92.0 92.5 91.3 69.0 6.1 25:20 92.0 92.5 91.1 69.1 6.1 25:30 92.092.7 91.5 69.2 6.1 25:40 92.0 92.9 92.1 69.2 6.1 25:50 92.0 92.5 91.869.2 6.1 26:0  92.0 92.4 91.1 69.1 6.1 26:10 92.0 92.5 91.1 69.0 6.226:20 92.0 92.8 91.8 69.2 6.1 26:30 92.0 92.8 92.2 69.1 6.2 26:40 92.092.4 91.4 69.0 6.2 26:50 92.0 92.5 91.1 69.1 6.2 27:0  92.0 92.7 91.369.3 6.1 27:10 92.0 92.9 92.0 69.3 6.1 27:20 92.0 92.6 92.0 69.3 6.127:30 92.0 92.5 91.2 69.1 6.2 27:40 92.0 92.6 91.1 69.2 6.1 27:50 92.092.8 91.6 69.3 6.1

[0033] TABLE 12 t Timp. Tintern. Ting. Tout. U. 28:0  92.0 92.8 92.269.3 6.1 28:10 92.0 92.5 91.7 69.4 6.1 28:20 92.0 92.5 91.1 69.5 5.928:30 92.0 92.7 91.3 69.5 5.9 28:40 92.0 92.9 92.0 69.3 5.9 28:50 92.092.6 91.9 69.3 6.0 29:0  92.0 92.5 91.2 69.3 5.9 29:10 92.0 92.6 91.169.4 5.9 29:20 92.0 92.9 91.7 69.3 5.9 29:30 92.0 92.9 92.2 69.4 5.929:40 92.0 92.5 91.6 69.3 5.9 29:50 92.0 92.5 91.1 69.4 5.9 30:0  92.092.8 91.5 69.3 5.9 30:10 92.0 92.9 92.1 69.3 5.9 30:20 92.0 92.6 91.869.3 5.9 30:30 92.0 92.5 91.1 69.3 5.9 30:40 92.0 92.7 91.3 69.4 5.830:50 92.0 92.9 92.0 69.5 5.8 31:0  92.0 92.7 92.0 69.3 5.8 31:10 92.092.5 91.2 69.3 5.8

[0034] TABLE 13 t Timp. Tintern. Ting. Tout. U. 31:20 92.0 92.6 91.169.3 5.8 31:30 92.0 92.9 91.8 69.4 5.7 31:40 92.0 92.8 92.2 69.3 5.731:50 92.0 92.5 91.3 69.4 5.7 32:0 92.0 92.7 91.1 69.3 5.7 32:10 92.092.9 91.7 69.4 5.6 32:20 92.0 92.8 92.2 69.3 5.6 32:30 92.0 92.5 91.369.5 5.6 32:40 92.0 92.5 91.1 69.5 5.6 32:50 92.0 92.8 91.6 69.5 5.633:0 92.0 92.9 92.2 69.5 5.6 33:10 92.0 92.6 91.5 69.5 5.6 33:20 92.092.5 91.1 69.6 5.6 33:30 92.0 92.8 91.4 69.7 5.5 33:40 92.0 92.9 92.069.6 5.5 33:50 92.0 92.7 91.8 69.7 5.4 34:0 92.0 92.5 91.1 69.6 5.534:10 92.0 92.7 91.2 69.6 5.5 34:20 92.0 92.9 91.9 69.7 5.4 34:30 92.092.8 92.2 69.6 5.5

[0035] TABLE 14 t Timp. Tintern. Ting. Tout. U. 34:40 92.0 92.5 91.369.5 5.4 34:50 92.0 92.6 91.1 69.5 5.5 35:0 92.0 92.8 91.5 69.6 5.435:10 92.0 92.9 92.1 69.5 5.4 35:20 92.0 92.6 91.7 69.3 5.5 35:30 92.092.5 91.1 68.9 5.6 35:40 92.0 92.7 91.3 68.8 5.6 35:50 92.0 92.9 91.968.8 5.6 36:0 92.0 92.7 92.0 68.7 5.6 36:10 92.0 92.5 91.3 68.8 5.636:20 92.0 92.6 91.1 68.8 5.6 36:30 92.0 92.9 91.9 68.8 5.5 36:40 92.092.8 92.2 68.8 5.6 36:50 92.0 92.5 91.3 68.6 5.6 37:0 92.0 92.7 91.168.7 5.6 37:10 92.0 92.8 91.5 68.8 5.5 37:20 92.0 92.9 92.2 68.7 5.637:30 92.0 92.6 91.7 68.5 5.6 37:40 92.0 92.5 91.1 68.5 5.6 37:50 92.092.7 91.3 68.4 5.6

[0036] TABLE 15 t Timp. Tintern. Ting. Tout. U. 38:0 92.0 93.0 92.1 68.65.6 38:10 92.0 92.6 91.8 68.5 5.6 38:20 92.0 92.5 91.1 68.6 5.6 38:3092.0 92.7 91.2 68.6 5.5 38:40 92.0 92.9 91.7 68.5 5.6 38:50 92.0 92.992.2 68.6 5.5 39:0 92.0 92.6 91.6 68.6 5.5 39:10 92.0 92.6 91.1 68.6 5.439:20 92.0 92.8 91.3 68.6 5.5 39:30 92.0 92.9 92.0 68.5 5.5 39:40 92.092.7 91.9 68.4 5.5 39:50 92.0 92.5 91.1 68.5 5.4 40:0 92.0 92.7 91.168.5 5.4 40:10 92.0 92.9 91.7 68.5 5.4 40:20 92.0 92.8 92.2 68.6 5.440:30 92.0 92.5 91.3 68.5 5.4 40:40 92.0 92.6 91.1 68.5 5.3 40:50 92.092.8 91.5 68.6 5.3 41:0 92.0 92.8 92.2 68.5 5.3 41:10 92.0 92.6 91.568.6 5.3

[0037] TABLE 16 t Timp. Tintern. Ting. Tout. U. 41:20 92.0 92.5 91.168.5 5.2 41:30 92.0 92.8 91.4 68.6 5.2 41:40 92.0 92.9 92.1 68.6 5.241:50 92.0 92.7 91.8 68.6 5.2 42:0 92.0 92.5 91.1 68.5 5.2 42:10 92.092.7 91.2 68.6 5.1 42:20 92.0 92.9 91.9 68.6 5.1 42:30 92.0 92.8 92.268.5 5.1 42:40 92.0 92.5 91.3 68.6 5.1 42:50 92.0 92.7 91.1 68.6 5.143:0 92.0 92.9 91.7 68.5 5.1 43:10 92.0 92.9 92.2 68.6 5.0 43:20 92.092.6 91.5 68.6 5.0 43:30 92.0 92.5 91.1 68.7 5.0 43:40 92.0 92.7 91.368.7 5.0 43:50 92.0 92.9 91.9 68.6 5.0 44:0 92.0 92.7 92.0 68.6 5.044:10 92.0 92.5 91.3 68.6 5.0 44:20 92.0 92.7 91.2 68.7 4.9 44:30 92.093.0 91.8 68.8 4.9

[0038] TABLE 17 t Timp. Tintern. Ting. Tout. U. 44:40 92.0 92.8 92.268.9 4.8 44:50 92.0 92.5 91.3 68.8 4.8 45:0 92.0 92.6 91.1 68.8 4.845:10 92.0 92.8 91.4 68.9 4.7 45:20 92.0 92.9 92.2 68.9 4.7 45:30 92.092.7 91.8 68.8 4.7 45:40 92.0 92.5 91.1 68.9 4.7 45:50 92.0 92.7 91.168.9 4.6 46:0 92.0 92.9 91.8 68.9 4.7 46:10 92.0 92.8 92.2 69.0 4.646:20 92.0 92.5 91.3 68.9 4.6 46:30 92.0 92.7 91.1 68.9 4.5 46:40 92.092.9 91.7 68.9 4.5 46:50 92.0 92.9 92.2 68.8 4.5 47:0 92.0 92.6 91.568.8 4.5 47:10 92.0 92.6 91.1 68.9 4.5 47:20 92.0 92.8 91.4 69.0 4.547:30 92.0 93.0 92.2 69.0 4.4 47:40 92.0 92.7 91.8 69.1 4.4 47:50 92.092.5 91.1 69.1 4.4

[0039] TABLE 18 t Timp. Tintern. Ting. Tout. U. 48:0 92.0 92.7 91.1 69.14.4 48:10 92.0 92.9 91.8 69.0 4.4 48:20 92.0 92.8 92.2 69.0 4.5 48:3092.0 92.5 91.3 68.9 4.4 48:40 92.0 92.7 91.1 69.0 4.4 48:50 92.0 92.991.5 69.0 4.4 49:0 92.0 92.9 92.3 69.2 4.3 49:10 92.0 92.6 91.5 69.0 4.349:20 92.0 92.5 91.1 68.9 4.5 49:30 92.0 92.7 91.3 68.8 4.5 49:40 92.092.9 91.8 68.8 4.5 49:50 92.0 92.8 92.2 68.6 4.6 50:0 90.8 92.5 91.368.7 4.7 50:10 75.4 89.3 87.1 67.9 5.1 50:20 60.1 87.5 85.2 67.0 5.650:30 44.8 86.0 84.0 66.1 6.1 50:40 29.4 84.9 82.9 65.6 6.4 50:50 14.183.9 82.0 65.4 6.5 0:0 0.0 0.0 0.0 0.0 0.0 0:0 0.0 0.0 0.0 0.0 0.0

[0040] While the problem of delamination is solved through the thermaltreatment of the PVAL, the problem of losses through inadequate welds issolved by using a horizontal apparatus which, in terms of concept,appears to be the opposite for filling a blister pack with perfumeshaving the above stated properties, and not lastly the fact that insidethe blister pack a minimum degree of empty space must be left, whichmeans for a horizontal apparatus that no headroom exists at all.

[0041] The absence of headroom causes leaking of the liquid during thetransport of the films, with problems not only in terms of quality forthe product but also environmental problems. All this is solved bymodifying a standard horizontal apparatus for its use with plasticmaterials which are by their very nature elastic and therefore present avariable behavior during the various phases of transport of the films.

[0042] The “standard” apparatus is an apparatus designed and implementedfor confectioning miniature packages (cream, jams etc.) or 75-mlpackages for yoghurt.

[0043] For this kind of operation polypropylene is normally used, amaterial which is rather rigid and therefore does not present the abovestated problems in the phase of use.

[0044] In order to avoid all the problems due to the elasticity of thematerial, the following modifications are carried out:

[0045] a) substituting the original plate for heating the PE/PP/PA atthe outset of thermoforming so as to ensure planarity of the materialduring that thermoforming.

[0046] b) Substituting the fluid of the hydraulic circuit with airincluding oil for a transport of the films in a more uniform and smoothway.

[0047] c) Provision of tensioning organs with rollers on the PVAL toensure maximum tension and planarity to the film prior to contact withthe already filled container and prior to welding. Welding takes place amoment after the PVAL contacts the blister pack body.

[0048] d) Welding is effected through the simultaneous contact of malemould and female mould in the plane intermediate to their strokes.Considering the quasi total lack of headspace, leakage of liquid wouldotherwise occur. The headspace in the miniature packages, regardless ofthe viscosity of the products, varies from 5 to 15 mm. All this isrealised by using highly sophisticated flow regulators on the hydrauliccircuit.

[0049] e) Modification of the system for apportioning perfume into theinside of the blister pack. In view of the nature of the liquid and itsquantity inside all of the blister packs, a needle valve system with 8needles (the working module equals 8 blister packs/cycle) is realised.This system guarantees filling operations from 3 to 8 ml (+0.5%) andguarantees the absence of spill during transport. Liquid losses duringthis phase would compromise the welding downstream.

[0050] f) Lastly but nevertheless not less important, an automaticsystem of placing the blister packs inside the container of use isrealised by means of a manipulator and an alignment conveyor on whichthe containers are placed automatically. On this conveyor then takesplace the closing of the containers, which are from there forwarded tothe packaging machine.

[0051] The appended drawings show an apparatus according to theinvention for the production of the blister packs in accordance with theprocess described above, wherein:

[0052]FIG. 1 shows the apparatus in its entire extension;

[0053]FIG. 2 shows the apparatus in plan view.

[0054] (1) designates the roll for the web that is intended to form thelower part of the blister pack.

[0055] The web (2) enters into the heating station (3) and successivelyinto the forming station (4) to then pass through the apportioning andfilling station (5).

[0056] At this point the web (6) is unrolled from the roll (7) andpassing over a tensioning organ (8) comes to lie on the lower web (2)which is already filled, and the blister pack is closed by means of thewelding station (9). After this, the web with the formed and filledblister packs passes through a cooling station (10) and reaches thecutting and punching station (11).

[0057] Waste material is grasped and rolled up by a take-up roller (12).

[0058] The individual blister packs (13 in FIG. 2) reach a manipulator(14) which automatically deposits them in the containers located on theconveyor (15).

[0059] The shapes of both the plastic blister packs and of thecontainers may be different.

1. Process for the production of plastic blister packs for containingliquid perfumes to be used as progressive-release deodorants,characterised in that the polyvinyl alcohol (PVAL) used for the top partof the blister pack is subjected to a thermal treatment in a furnace. 2.Process according to claim 1, characterised in that the PVAL rollsplaced in the furnace are subjected to temperatures starting out fromthe ambient temperature up to 80-98° C. for a time period that variesfrom a minimum of 30 h to a maximum of 200 h.
 3. Process for theproduction of plastic blister packs, characterised in that forming,filling and sealing are carried out by using a horizontal apparatus. 4.Apparatus for the production of plastic blister packs, characterised inthat for the transport of the films (2 and 6) the fluid of the hydrauliccircuit is replaced with air including oil.
 5. Apparatus for theproduction of plastic blister packs according to claim 4, characterisedin that the apportioning and filling station (5) is equipped with aneedle valve system having 8 needles.
 6. Apparatus for the production ofplastic blister packs according to claims 4 and 5, characterised in thatthe welding in the welding station (9) takes place through simultaneouscontact of the male mould and the female mould in the plane intermediateto their strokes.
 7. Apparatus for the production of plastic blisterpacks according to claims 4 to 6, characterised in that an automaticsystem for the placement of the blister packs inside the container ofuse is realised by means of a manipulator (14) and an alignment conveyor(15).